WASHINGTON (AP) — President Barack Obama on Tuesday conceded that an immigration overhaul cannot be achieved by his August deadline. With House Republicans searching for a way forward on the issue, the president said he was hopeful a bill could be finalized this fall — though even that goal may be overly optimistic.

The president, in a series of interviews with Spanish language television stations, also reiterated his insistence that any legislation include a pathway to citizenship for the 11 million people in the U.S. illegally. Many House GOP lawmakers oppose the citizenship proposal, hardening the differences between the parties on the president’s top second-term legislative priority.

“It does not make sense to me, if we’re going to make this once-in-a-generation effort to finally fix this system, to leave the status of 11 million people or so unresolved,” he said during an interview with Telemundo’s Denver affiliate.

The White House sees the president’s outreach to Hispanics as a way to keep up enthusiasm for the overhaul among core supporters even as the legislative prospects in Washington grow increasingly uncertain.

Some Republicans view support for immigration reform as central to the party’s national viability given the growing political power of Hispanics. But many House GOP lawmakers representing conservative — and largely white — districts see little incentive to back legislation.

The president said the lack of consensus among House Republicans will stretch the immigration debate past August, his original deadline for a long-elusive overhaul of the nation’s fractured laws.

“That was originally my hope and my goal,” Obama said. “But the House Republicans I think still have to process this issue and discuss it further, and hopefully, I think, still hear from constituents, from businesses to labor, to evangelical Christians who all are supporting immigration reform.”

Supporters are working on strategy to get the House to sign off on an overhaul. On Tuesday, most members of the so-called Gang of Eight — the bipartisan group of senators that authored the Senate immigration bill — met in the Capitol with a large group of advocates from business, religious, agriculture and other organizations to urge everyone to work together to move the issue through the House.

The senators distributed a list of 121 House Republicans seen as persuadable in favor of the bill and discussed honing a message for Congress’ monthlong August recess, when House members will meet with constituents and potentially encounter opposition to immigration legislation.

“When we go into the August break we want to be sure everybody’s working hard and trying to make our case,” said Sen. John McCain, R-Ariz., after the meeting.

The landmark bill passed by the Senate last month would tighten border security, expand the highly skilled worker program and set up new guest worker arrangements for lower-skilled workers and farm laborers. It would also provide a pathway to citizenship for many of the 11 million immigrations illegally in the U.S., one that includes paying fees, learning English and taking other steps.

During his interview with Univision’s Los Angeles affiliate, Obama said the citizenship pathway “needs to be part of the bill.”

House Republicans have balked at the Senate proposal, with GOP leaders saying they prefer instead to tackle the issue in smaller increments. Many GOP representatives also oppose the prospect of allowing people who came to the U.S. illegally to become citizens.

House Republicans are considering other options, including proposals to give priority for legalization to the so-called Dreamers — those who were brought the U.S. illegally as children. Allowing only those individuals to obtain citizenship could shield Republicans from attacks by conservatives that they’re giving a free pass to those who voluntarily broke the law.

“I think that group of people — some call Dreamers — is a group that deserves perhaps the highest priority attention,” Rep. Bob Goodlatte, who chairs the House Judiciary Committee, said at an immigration-related conference in California Monday. “They know no other country.”

Goodlatte and House Majority Leader Eric Cantor, both Virginia Republicans, are working on a bill to address the status of those immigrants, although the timing is uncertain. And Goodlatte cautioned that any such measure should hinge on completion of enforcement measures to prevent parents from smuggling their children into the U.S. in the future.

The House is not expected to act on any legislation before the August recess, though the House Judiciary Committee could hold a hearing on the bill dealing with people brought to the U.S. when they were young.

Obama also spoke with the Telemundo station in Dallas and the Univision station in the New York/New Jersey area.